Mit Museum Talk
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Talk at MIT Museum workshop "Photons, Neurons and Bits: Holography for the 21st Century"
![Light Field [Levoy & Hanrahan 1996] Radiance as a function of position and direction 5D Plenoptic function (x, y, z, , f) ,[object Object],[object Object]](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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Mit Museum Talk
- 1. 4D Capture and 6D Display Ankit Mohan MIT Media Lab
- 3. 4D Illumination Field Measure all the incoming light rays
- 4. 4D x 4D = 8D Reflectance Field Ratio:Rij = (outgoing rayi) / (incoming rayj)
- 5. Geometric Optics basedHigh Dimensional Capture & Display 4D capture: 4D outgoing rays 6D display: 4D outgoing rays + 2D incoming rays
- 6. Light Field Inside a Camera s u Lenslet-based Light Field camera / Integral Photography s u [Lippman 1908, Adelsonand Wang, 1992, Ng et al. 2005]
- 7. Adaptive Optics microlens array 125μ square-sided microlenses Stanford Plenoptic Camera [Ng et al 2005] Contax medium format camera Kodak 16-megapixel sensor 4000 × 4000 pixels ÷ 292 × 292 lenses = 14 × 14 pixels per lens
- 8. Digital Refocusing[Ng et al 2005] Can we do this without the microlens array?
- 9. Coded Aperture Camera Lens aperture is modified Broadband coded mask
- 10. LED In Focus Photo
- 11. Out of Focus Photo: Open Aperture
- 12. Out of Focus Photo: Coded Aperture
- 15. Mask? Mask? Sensor Sensor Sensor Sensor Mask Mask Mask? Sensor 4D Light Field from 2D Photo: Heterodyne Light Field Camera Full Resolution Digital Refocusing: Coded Aperture Camera
- 16. Sensor Mask Mask based Light Field Camera
- 17. Optical Heterodyning Receiver: Demodulation High Freq Carrier 100 MHz Incoming Signal Baseband Audio Signal ReferenceCarrier 99 MHz Software Demodulation Main Lens Object Mask Sensor RecoveredLight Field Incident Modulated Signal Photographic Signal(Light Field) Carrier ReferenceCarrier
- 18. Captured 2D Photo Encoding due to Mask
- 19. Heterodyning – Frequency domain 2D FFT Traditional Camera Photo Magnitude of 2D FFT 2D FFT Heterodyne Camera Photo Magnitude of 2D FFT
- 20. Computing 4D Light Field 2D Sensor Photo, 1800*1800 2D Fourier Transform, 1800*1800 2D FFT 9*9=81 spectral copies Rearrange 2D tiles into 4D planes 4D IFFT 200*200*9*9 4D Light Field 200*200*9*9
- 21. 4D Capture Results Captured Photo Refocusing Changing Views
- 25. 4D Display Optical Setup
- 26. Towards a 6D Display
- 28. 6D building block: light sensitive projector
- 29. 6D Display Optical Setup
- 30. 6D modulator pattern structure
- 31. 6D modulator pattern structure varying observer direction
- 34. 6D Display: Martin Fuchs, Hans-Peter Seidel, Hendrik P. A. Lensch, RameshRaskar
Hinweis der Redaktion
- live demonstration: show 4D hand-held / bottle with light bulb source. After it is demonstrated, hand it round, then continue on how to do this.
- end of presentation
- TO DO TO DO TO DOKann man da was highlighten beim erklären?now, we can add some blockers and modulate; the design you currently see. One deficit: the cones on the receiver surface do not stay below the lens, and do not have a precise overlap
- This is what the 6D prototype looks like …
- This is one of 49 “single pixel” blocks for the 6D display. It projects out different patterns according to the incident light illumination.To test it separately, we feed it with a special pattern
- Luckily, we can add more lenses. This rotates the beam back, which makes it a translation operation.